Concrete drilling device



March 18, 1952 E. w. TAYLOR 2,590,053

CONCRETE DRILLING DEVICE Filed April 7, 1950 FIG 5 INVENTOR F IG J]; ERvm w. TAYLOR ATTORNEYS Patented Mar. 18, 1952 UNITED STATES PATENT OFFICE CONCRETE DRILLING DEVICE Ervin W. Taylor, Micco, Fla.

Application April '7, 1950, Serial No. 154,527

2 Claims.

This invention relates to drilling devices, but more particularly to a drilling device which is especially suitable to the drilling of concrete or similar materials.

The principal object of this invention is to provide a drilling device having a cutter which may be conveniently mounted in a plurality of cutting positions.

Another object of this invention is to provide a drilling device which is efficient and easy to use, and which can be manufactured at very little cost.

Other and further objects and advantages will become apparent from a consideration of the following claims and specification in conjunction with the drawing, wherein:

Figure 1 is a plan view of the device forming this invention;

Figure 2 is a side elevational view of the device with a portion thereof shown in section;

Figure 3 is a view similar to Figure l with one of the bifurcated arms removed to show the structure of the cutter;

Figures 4 and 5 are fragmentary plan views of the device, each showing a modified form of a cutter.

With continued reference to the drawing, the device forming this invention comprises, in general, a drill embodying an elongated shank 5 which has one end provided with means for attachment to a drilling tool, and has the other end formed to support a cutter 6.

The shank 5, which is preferably of steel construction, has an elongated body 1 and a tapered head portion 8 at one end which is designed to be held within the socket of a conventional brace (not shown). The other end of the body 1 is bifurcated to define a pair of spaced, parallel, longitudinally extending arms 9, 9'. The arms 9, 9' are provided adjacent their free ends with opposed, aligned apertures l0, l0. Between the arms 9, 9', the body 1 is provided with a triangularly shaped portion II for a purpose to be later described.

The cutter 6 is preferably a flat, hardened steel element. l2, and is positioned between the arms 9, 9' of the body I. .The cutter element I2 is loosely supported in position by means of a pin, such as a screw l3, which extends through the aligned apertures I0, Ill and also freely through the center of the cutter element 12. One of the arms, as the arm I0, is threaded to receive the screw l3. The screw I3 is, therefore, easily removable to thereby release the cutter 6 from its operative position between the arms 9, 9'.

The cutter element I2 is provided with a plurality of cutting teeth [4 adjacent opposite ends thereof. When the cutter 6 is in its operative position, the triangularly-shaped portion ll of the body 1 projects between a selected pair of the teeth It and engages therewith, to thereby lock the cutter B in a fixed position relative to the body 1.

The modifications of the device shown in Figures 4 and 5 are similar to the preferred form of the device shown in Figures 1 through 3, except that different cutters are therein employed. In Figure 4, a cutter 6 is used which is similar to the cutter 6 of Figure l, but is provided with a greater number of cutting teeth I4. The device shown in Figure 5 employs a fiat, circularlyshaped cutter 6" having a plurality of circumferentially spaced teeth l4. The cutters 6' and 6 may be substituted for the cutter 6 of the preferred form whenever the chaarcter of the material being cut demands their employment. It has been found that when large holes are desired to be drilled, the forms of Figures 4 and 5 are more efiicient than the form of the device shown in, Figure 1.

It will be noted that, the drilling device forming this invention employs a cutter, such as the cutter E, which'may be easily and conveniently mounted in a variety of operative positions. For example, when the teeth I4 on one end of the cutter body l2 are worn, the cutter 6 may be conveniently remounted or reversed so that the teeth I4 on the opposite end of the cutter body [2 are exposed to the work. This is accomplished by merely removing the screw l3 from the arms 9, 9', relocating the cutter 6, and then replacing the screw l3. The cutters 6' and B" of the forms in Figures 4 and 5, respectively, are similarly mounted and remounted in a variety of operative positions.

I claim:

1. A drilling device comprising an elongated shank having means for attachment to a drilling tool on one end thereof, the other end of said shank being bifurcated to define a pair of longitudinally extending parallel arms, a fiat cutter removably mounted between said arms, said out-- ter being provided with a plurality of spaced cutting teeth adjacent opposite edges thereof, a pin extending transversely through said arms and said cutter and removably secured to one of said arms for loosely supporting said cutter, and means on the bifurcated end of said shank and engageable between a pair of said teeth to thereby 3 look the latter in a fixed position relative to said shank.

2. A drilling device comprising an elongated shank having means for attachment to a drilling tool on one end thereof, the other end of said shank being bifurcated to define a pair of longitudinally extending parallel arms, a fiat cutter removably mounted between said arms, a pin extending transversely through said arms and said cutter and removably secured to one of said arms for loosely supporting said cutter, said cutter being provided with a plurality of spaced cutting teeth adjacent opposite edges thereof, and a triangularly-shaped element on the bifurcated end of said shank having its apex projecting between a pair of said teeth and engageable therewith to thereby lock said cutter in a fixed position relative to said shank.

ERVIN W. TAYLOR.

REFERENCES CITED The following references are of record in the die of this patent:

UNITED STATES PATENTS 1 Number Name Date 47,812 Grier et a1. May 23, 1865 124,089 Shepardson Feb. 27, 1872 764,664 Jones July 12, 1904 786,137 Moser Mar. 28, 1905 15 1,881,024 Lang Oct. 4, 1932 

